In case you forgot:
That means changing weather patterns over extended periods around the globe. Most of all, it means a warmer atmosphere and ocean temperatures, melting ice caps and rising sea levels.
But it also means more numerous and severe floods and droughts, as well as more extreme climate and more climate change related disasters like hurricanes and tornadoes.
Oh yeah, and it’s completely human made.
Children, who are the least responsible for climate change, are often hit hardest.
So are people who already live in disadvantaged areas that are prone to flooding and droughts. This is why UNICEF is more than excited about the Paris Climate Agreement which was negotiated last December.
This week, world leaders are gathering in New York to actually sign it.
In the run-up to the signing ceremony, people from around the world have posted their photos online to form a #ClimateChain to raise awareness of climate change and highlight what they would most like to protect.
UNICEF will be reporting live from the General Assembly where heads of state and representatives of 189 countries and regions are showing up and giving speeches.
UNICEF youth representative and climate advocate with UNICEF Getrude Clement,16, from Tanzania will be there to give a powerful speech reminding world leaders why climate action is so crucial for children.
Ueli Johner is the creative producer in UNICEF’s Social Engagement Team in New York.